fix this logic to actually be correct... the fd can't be *both* -1 and an...

fix this logic to actually be correct... the fd can't be *both* -1 and an array index to be checked in rfds/efds (bug found by gcc-4.3)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@114845 65c4cc65-6c06-0410-ace0-fbb531ad65f3